Ok lady's i need alittle advise please please?

ok so my last period was Jan13th I was due to ovulate on the 26th hubby and i did the bd 22-24-25-26-27 i took a prego test 10 days past ovulation got a BFN but today I took a test and there was a very very faint blue line in the positive window but it was hard to see it was so faint that was the last prego test I had to a ran to walmart bought another one and took it(diff. kin) and there was only one line nothing to indacate pregnacy could I be prego and why would both test show something diff. my hubby even seen the very very faint line so i know im not seeing things lol help please...i will test again in a few days if af dont get here but just wanted someones oppion thanks